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From: Alan Cox <alc@FreeBSD.org>
Date: Fri, 10 Aug 2012 05:47:05 +0000 (UTC)
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Subject: svn commit: r239171 - head/sys/i386/xen
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Author: alc
Date: Fri Aug 10 05:47:04 2012
New Revision: 239171
URL: http://svn.freebsd.org/changeset/base/239171

Log:
  Eliminate an unnecessary acquisition and release of the page queues lock
  from pmap_pte().  PT_SET_MA() is not a queued mapping update, but instead
  an immediate mapping update, so the page queues lock is not required here.
  
  Reviewed by:	cperciva

Modified:
  head/sys/i386/xen/pmap.c

Modified: head/sys/i386/xen/pmap.c
==============================================================================
--- head/sys/i386/xen/pmap.c	Fri Aug 10 05:00:50 2012	(r239170)
+++ head/sys/i386/xen/pmap.c	Fri Aug 10 05:47:04 2012	(r239171)
@@ -965,9 +965,7 @@ pmap_pte(pmap_t pmap, vm_offset_t va)
 		mtx_lock(&PMAP2mutex);
 		newpf = *pde & PG_FRAME;
 		if ((*PMAP2 & PG_FRAME) != newpf) {
-			vm_page_lock_queues();
 			PT_SET_MA(PADDR2, newpf | PG_V | PG_A | PG_M);
-			vm_page_unlock_queues();
 			CTR3(KTR_PMAP, "pmap_pte: pmap=%p va=0x%x newpte=0x%08x",
 			    pmap, va, (*PMAP2 & 0xffffffff));
 		}